Canon Pixma MX850 Service Manual. Parts Catalog

MX850 Service Manual

Revision 0

QY8-13BR-000

COPYRIGHTc2008 CANON INC. CANON MX850 012008 XX 0.00-0

Scope

This manual has been issued by Canon Inc., to provide the service technicians of this product with the information necessary for qualified persons to learn technical theory, installation, maintenance, and repair of products. The manual covers information applicable in all regions where the product is sold. For this reason, it may contain information that is not applicable to your region.

This manual does not provide sufficient information for disassembly and reassembly procedures. Refer to the graphics in the separate Parts Catalog.

Revision

This manual could include technical inaccuracies or typographical errors due to improvements or changes made to the product. When changes are made to the contents of the manual, Canon will release technical information when necessary. When substantial changes are made to the contents of the manual, Canon will issue a revised edition.

The following do not apply if they do not conform to the laws and regulations of the region where the manual or product is used:

Trademarks

Product and brand names appearing in this manual are registered trademarks or trademarks of the respective holders.

All rights reserved. No parts of this manual may be reproduced in any form or by any means or translated into another language without the written permission of Canon Inc., except in the case of internal business use.

MX850

TABLE OF CONTENTS

1. MAINTENANCE

1-1. Adjustment, Periodic Maintenance, Periodic Replacement Parts, and Replacement Consumables by Service

Engineer

1-2. Customer Maintenance

1-3. Special Tools

1-4. Serial Number Location

2. LIST OF ERROR DISPLAY / INDICATION

2-1. Operator Call Errors

2-2. Service Call Errors

2-3. Fax Errors

2-4. Other Error Messages

2-5. Warnings

2-6. Troubleshooting by Symptom

3. REPAIR

3-1. Notes on Service Part Replacement

3-2. Special Notes on Repair Servicing

(1) External housing, ADF, and scanner unit removal

(2) Printer unit separation from the bottom case (how to remove the screw under the purge unit)

(3) Operation panel removal

(4) AC adapter attachment

(5) Emblem removal

(6) Cable wiring and connection

3-3. Adjustment / Settings

(1) Paper feed motor adjustment

(2) Document pressure sheet (sponge sheet) replacement

(3) Grease application

(4) Ink absorber counter setting

(5) User mode

(6) Service mode

A: Service mode operation

B: Destination settings

C: Ink absorber counter resetting

D: Ink absorber counter setting

E: LF / Eject correction

F: Button and LCD test

(7) PTT parameter mode

A: PTT parameter mode operation

B: #1 BIT SWITCH

C: #2 NUMERIC PARAM

D: Confirmation of the setting values

3-4. Verification Items

(1) Service test print

(2) Ink absorber counter value print

4. MACHINE TRANSPORTATION

MX850 TABLE OF CONTENTS

1 / 45

1. MAINTENANCE

1-1. Adjustment, Periodic Maintenance, Periodic Replacement Parts, and Replacement

Consumables by Service Engineer

(1) Adjustment

Adjustment Timing Purpose Tool

EEPROM initialization

Destination settings (EEPROM settings)

Ink absorber counter resetting (EEPROM settings)

Ink absorber counter value setting (EEPROM settings)

Ink absorber replacement

Paper feed motor position adjustment

- At logic board replacement To initialize settings None. Perform in the service mode.

- At logic board replacement To set destination. None. Perform in the service mode.

- At logic board replacement

- At ink absorber replacement

- At logic board replacement To set the ink amount data in

- When the ink absorber

becomes full

- At paper feed motor

replacement

To reset the ink absorber counter.

the ink absorber to the ink absorber counter.

To replace the ink absorber with a new one.

To adjust the belt tension. (Position the paper feed motor so that the belt is stretched tight.)

None. Perform in the service mode.

Screwdriver, a pair of tweezers, etc.

None. 5 min.

Approx.

time

1 min.

20 min.

CD / DVD detection sensor light volume

correction

Automatic print head alignment

Manual print head alignment

Grease application - At carriage unit replacement

Ink system function check

- At carriage unit replacement

- At logic board replacement

- At print head replacement

- At logic board replacement

- When print quality is not

satisfying

- At print head replacement

- At logic board replacement

- When print quality is not

satisfying

- At lift cam replacement

- To gears

- At Easy-Scroll Wheel

replacement

- At logic board replacement

- At spur base replacement

- At carriage unit replacement

To correct the light volume for the CD / DVD detection sensor.

To secure the dot placement accuracy.

To maintain sliding properties of the following items:

- Carriage shaft

- Lift cam bushing

- Machine sliding portions (gears)

- Wheel base

To maintain detection functionality for presence of the ink tanks and each ink tank position.

None. Perform in the service mode.

None. Perform in the user mode.

FLOIL KG-107A 1 min.

None. Perform in the service mode.

5 min.

10 min. (Use MP-

101.)

13 min.

1 min.

LCD language - At logic board replacement To set the language to be None. 1 min.

settings displayed on the LCD. Perform in the user

2 / 45

mode.

Platen glass protection sheet (document pressure sheet) position adjustment

LF / Eject correction

*1: Only for CD / DVD printing supported regions.

- DO NOT loosen the red screws at both ends of the carriage shaft, securing the print head position, as they are not re-adjustable.

- The red screws securing the paper feed motor may be loosened only at replacement of the paper feed motor unit.

- For the automatic print head alignment, use Matte Photo Paper (MP-101), which is packed with the machine before shipment. If Matte Photo Paper (MP-101) is not available, perform manual print head alignment using plain paper.

- At protection sheet replacement

- At document feed base replacement

- At logic board replacement

- At feed roller ass'y replacement

- At logic board replacement

- At platen unit replacement

To maintain scanning accuracy, hold the sheet with the long side down, then fit its upper left corner to the platen glass reference mark (back left).

To correct line feeding (LF roller diameter).

To correct line feeding (eject roller diameter).

None. 1 min.

None. Perform in the service mode.

5 min. (LF correction and Eject correction is performed at the same time.)

(2) Periodic maintenance

No periodic maintenance is necessary.

(3) Periodic replacement parts

There are no parts in this machine that require periodic replacement by a service engineer.

(4) Replacement consumables

There are no consumables that require replacement by a service engineer.

1-2. Customer Maintenance

Adjustment Timing Purpose Tool

Automatic print head alignment

- At print head replacement

- When print quality is not satisfying (uneven printing, etc.)

To ensure accurate dot placement.

- Machine buttons

- Matte Photo Paper (MP-

101)

- Computer (MP driver)

Approx.

time

10min. (Use MP-101.)

Manual print head alignment

Print head cleaning

- At print head replacement

- When print quality is not satisfying (uneven printing, etc.)

When print quality is not satisfying. To improve nozzle

To ensure accurate dot placement.

conditions.

- Machine buttons

- Computer (MP driver)

- Machine buttons

- Computer (MP

13 min.

1 min.

driver)

3 / 45

Print head deep cleaning

Ink tank replacement

Paper feed roller cleaning

Rear tray subroller cleaning

Bottom plate cleaning

Scanning area cleaning

When print quality is not satisfying, and not improved by print head cleaning.

When an ink tank becomes empty. ("No ink error" displayed on the monitor or on the machine LCD, or short flashing of an ink tank LED)

- When paper does not feed properly.

- When the front side of the paper is smeared.

When the paper fed from the rear tray is smeared due to ink mist attached to the rear tray sub-rollers.

When the back side of the paper is smeared. To clean the platen

When the platen glass or document pressure sheet is dirty.

To improve nozzle conditions.

To replace the empty ink tank.

To clean the paper feed rollers of the rear tray.

To clean the rear tray sub-rollers.

ribs.

To clean the platen glass and pressure sheet.

- Machine buttons

- Computer (MP driver)

--- 1 min.

- Machine buttons

- Computer (MP driver)

- Machine

buttons

- Machine buttons

- Computer (MP driver)

Soft, dry, and clean lint-free cloth.

2 min.

1 min.

Exterior cleaning When necessary To clean the machine

exterior

Soft, dry, and clean lint-free cloth.

1 min.

1-3. Special Tools

Name Tool No. Application Remarks

FLOIL KG-107A QY9-0057-000 To the carriage shaft sliding portions and lift cam bushing. In common with the MP600, etc.

1-4. Serial Number Location

On the carriage flexible cable holder (visible on the right of the carriage after the machine is turned on, the scanning unit is opened,

and the carriage stops at the ink tank replacement position)

<1. MAINTENANCE>

MX850 TABLE OF CONTENTS

4 / 45

2. LIST OF ERROR DISPLAY / INDICATION

Errors and warnings are displayed by the following ways:

1. Operator call errors are indicated by the Alarm LED lit in orange, and the error and its solution are displayed on the LCD in

text and by icon.

2. Messages during printing from a computer are displayed on the MP driver Status Monitor.

3. Error codes are printed in the "operator call/service call error record" area in EEPROM information print

Buttons valid when an operator call error occurs:

1. ON/OFF button: To turn the machine off and on again.

2. OK button: To clear and recover from an error. In some operator call errors, the error will automatically be cleared when

the cause of the error is eliminated, and pressing the OK button may not be necessary.

3. Stop/Reset button: To cancel the job at error occurrence, and to clear the error.

2-1. Operator Call Errors (by Alarm LED Lit in Orange)

Error

No paper in the rear tray.

Error code

[1000] --- Rear tray.

U No.

Message on the LCD Solution

There is no paper. Load paper and press [OK].

No CD / DVD tray*1.

[1001] --- There is no CD-R tray. Attach the

tray and press [OK].

No CD or DVD*1.

[1002] --- Printable disc is not set. Correctly

place a disc in the CD-R tray and press [OK].

No paper in the cassette. [1003] --- Cassette.

There is no paper. Load paper and press [OK].

Paper jam. [1300] --- The paper is jammed. Clear the

Paper jam in the rear

[1303] ---

paper and press [OK].

guide.

Paper jam in the under

[1304] ---

guide.

Ink may have run out. [1600] U041 The ink may have run out.

Replacing the ink tank is recommended.

Ink tank not installed. [1660] U043 The following ink tank cannot be

recognized. (Applicable ink tank icon)

Print head not installed, or not properly

[1401] U051 Print head is not installed. Install the

print head.

installed.

Print head temperature sensor error.

Faulty EEPROM data

[1403] U052 The type of print head is incorrect.

Install the correct print head.

[1405]

of the print head.

Inner cover error.

[1841*2, 1846 1851 1856

[1850*1, 1855

--- Inner cover is open. Close the inner

, , ]

cover and press [OK].

--- Open the inner cover, place the CD-

]

R tray and press [OK].

Confirm that the rear tray is selected as the paper source. Set the paper in the rear tray, and press the OK button.

Set the CD / DVD tray, and press the OK button.

Set a CD or DVD in the CD / DVD tray, and inset the CD / DVD tray in the proper position. Then, press the OK button.

Confirm that the cassette is selected as the paper source. Set the paper in the cassette, and press the OK button.

Remove the jammed paper, and press the OK button.

Replace the applicable ink tank, or press the OK button to clear the error without ink tank replacement. When the error is cleared by pressing the OK button, ink may run out during printing.

Install the applicable ink tank(s) properly, and confirm that the LED's of all the ink tanks light red.

Install the print head properly.

Re-set the print head. If the error is not cleared, the print head may be defective. Replace the print head.

Close the inner cover, and press the OK button.

Open the inner cover which functions as the CD / DVD tray feeder, set the CD / DVD tray in the

Multiple ink tanks of

5 / 45

the same color installed.

Ink tank in a wrong position.

Warning: The ink absorber becomes almost full.

The connected digital camera or digital video camera does not support Camera Direct Printing.

Automatic duplex printing cannot be performed.

Failed in automatic print head alignment.

The remaining ink amount unknown.

Ink tank not recognized. [1684] U140 The following ink tank cannot be

Ink tank not recognized. [1410

No ink (no raw ink). [1688] U163 The ink has run out. Replace the ink

Non-supported hub [2002] --- An unsupported USB hub is

[1681] U071 More than one ink tank of the

following color is installed.

[1680] U072 Some ink tanks are not installed in

place.

[1700,

1701]

[2001] --- The device may be incompatible.

[1310] --- This paper is not compatible with

[2500] --- Auto head align has failed. Press

[1683] U130 (Applicable ink tank icon)

1419]

--- Contact the support center or service center for ink absorber replacement. Press [OK] to continue printing.

Remove the device and check the manual supplied with the connected device.

duplex printing. Remove the paper and press [OK].

[OK] and repeat operation. <See manual>

The remaining level of the ink cannot be correctly detected.

recognized. (Applicable ink tank icon)

U150 The following ink tank cannot be

recognized. (Applicable ink tank icon)

tank. (Applicable ink tank icon)

connected. Remove the hub.

feeder, and press the OK button.

Replace the wrong ink tank(s) with the correct one (s).

Install the ink tank(s) in the correct position.

Replace the ink absorber, and reset its counter. [See

3-3. Adjustment / Settings, (6) Service mode.]

Pressing the OK button will exit the error, and enable printing without replacing the ink absorber. However, when the ink absorber becomes full, no further printing can be performed unless the applicable ink absorber is replaced.

Remove the cable between the camera and the machine.

The paper length is not supported for duplex printing. Press the OK button to eject the paper being used at error occurrence. Data which was to be printed on the back side of paper at error occurrence is skipped (not printed).

Press the OK button to clear the error, then perform the automatic print head again. (In the MX850, use Matte Photo Paper MP-101.)

An ink tank which has once been empty is installed. Replace the applicable ink tank with a new one. Printing with a once-empty ink tank can damage the machine. To continue printing without replacing the ink tank (s), press the Stop/Reset button for 5 sec. or longer to disable the function to detect the remaining ink amount. After the operation, it is recorded in the machine EEPROM that the function to detect the remaining ink amount was disabled.

A non-supported ink tank is installed (the ink tank LED is turned off). Install the supported ink tanks.

A hardware error occurred in an ink tank (the ink tank LED is turned off). Replace the ink tank(s).

Replace the empty ink tank(s), and close the scanning unit (printer cover). Printing with an empty ink tank can damage the machine. To continue printing without replacing the ink tank (s), press the Stop/Reset button for 5 sec. or longer to disable the function to detect the remaining ink amount. After the operation, it is recorded in the machine that the function to detect the remaining ink amount was disabled.

Remove the applicable USB hub from the PictBridge (USB) connector.

*1: Only for models supporting CD / DVD printing

*2: Only for models not supporting CD / DVD printing

2-2. Service Call Errors (by Cyclic Blinking of Alarm and Power LEDs)

6 / 45

Service call errors are indicated by the number of cycles the Alarm and Power LEDs blink, and the corresponding error code is

displayed on the LCD.

Cycles of

blinking of

Alarm and

Power LEDs

Error

2 times Carriage error [5100] An error occurred in the carriage

Error code

encoder signal.

Conditions

(Replacement of listed parts,

which are likely to be faulty)

- Carriage unit

- Timing slit film

- Logic board

- Carriage motor

3 times Line feed error [6000] An error occurred in the LF encoder

signal.

- Timing sensor unit

- Timing slit disk film

- Feed roller

- Logic board

- Paper feed motor

4 times Purge cam sensor error [5C00] An error occurred in the purge unit. - Purge unit

- Logic board

5 times ASF (cam) sensor error [5700] This error takes place when paper feeds

from the rear tray after an error occurred in the ASF cam sensor.

6 times Internal temperature

[5400] The internal temperature is not normal. - Logic board

- Sheet feed unit

- ASF_PE sensor board

- Logic board

error

7 times Ink absorber full [5B00,

5B01]

The ink absorber is supposed to be full. Message on the LCD:

- Ink absorber kit

Ink absorber full. Service required.

Error codes:

5B00: Main ink absorber is full (overseas). 5B01: Main ink absorber is full (Japan).

Solution

8 times Print head temperature

rise error

9 times EEPROM error [6800,

[5200] The print head temperature exceeded the

specified value.

A problem occurred in reading from or

6801]

writing to the EEPROM.

Error codes: 6800: Read error 6801: Write error

10 times VH monitor error [B200] The internal temperature exceeded the

specified value.

11 times Carriage lift mechanism

error

[5110] The carriage did not move up or down

properly.

12 times AP position error [6A00] An error occurred in the AP motor

during purging operation.

13 times Paper feed position error [6B00] An error occurred in the paper feed

motor during line feeding.

- Print head

- Logic board

- Print head

- Carriage unit

- Logic board

- Sheet feed unit

- PR lift shaft ass'y

- Carriage lift sensor unit

- Logic board

- Sheet feed unit

- Purge unit

- Logic board

- Sheet feed unit

- Logic board

14 times Paper feed cam sensor

error

[6B10] An error occurred in the paper feed cam

sensor during paper feeding from the cassette.

- Sheet feed unit

- Logic board

15 times USB Host VBUS

7 / 45

overcurrent

[9000] The USB Host VBUS is overloaded. - Logic board

16 times Pump roller sensor error [5C20] The pump roller position cannot be

detected.

17 times Paper eject encoder error [6010] An error occurred in the paper eject

encoder signal.

19 times Ink tank position sensor

error

22 times Scanner home position

error

Power LED turned off, and Alarm LED lit

ROM / RAM error --- The check sum value is incorrect in the

[6502] None of the ink tank position is detected. - Platen unit

[5010] The scanner unit cannot detect the home

position, or the scanner unit warming-up is not performed properly at power-on. On the LCD, "Scanner is not operating correctly." is displayed.

ROM check or RAM check at hardpower-on.

Before replacement of the logic board ass'y, check the ink absorber counter value (by service test print or EEPROM information print). If the counter value is 7% or more, also replace the ink absorber kit when replacing the logic board ass'y. If the counter value is less than 7%, register the current ink absorber counter value to the replaced new logic board instead.

[See 3-3. Adjustment / Settings, (6) Service mode, for details.]

- Purge unit

- Logic board

- Platen unit

- Timing sensor unit

- Timing slit disk eject film

- Paper feed motor

- Logic board

- Scanner unit

- Logic board

2-3. Fax Errors

For errors other than those listed below, please refer to the "G3 / G4 Facsimile Error Code List (Rev. 2)."

(1) User error codes

Error code TX / RX Meaning

#001 TX Document jam

#003 TX / RX Document is too long, or page time-over

#005 TX / RX Initial identification (T0 / T1) time-over

#009 RX Recording paper jam, or no recording paper

#012 TX No recording paper at the receiving machine

#017 TX Redial time-over, but no DT detected

#018 TX Auto dialing transmission error, or redial time-over

#022 TX Call failed (no dial registration)

#037 RX Memory overflow at reception of an image

#085 TX No color fax function supported in the receiving machine

#099 TX / RX Transmission terminated mid-way by pressing the Stop/Reset button

#995 TX / RX During TX (sending): Memory transmission reservation cancelled

(2) Service error codes

Error code TX / RX Meaning

##100 TX Re-transmission of the procedure signal has been attempted the specified number of times, but failed.

##101 TX / RX Sender's modem speed does not match the receiving machine.

During RX (receiving): Image data received in the memory cleared

##102 TX Fallback is not available.

8 / 45

##103 RX EOL has not been detected for 5 seconds (or 15 seconds in CBT).

##104 TX RTN or PIN has been received.

##106 RX The procedure signal has been expected for 6 seconds, but not received.

##107 RX Fallback is not available at the sending machine.

##109 TX After DCS transmission, a signal other than DIS, DTC, FTT, CFR, or CRP has been received, and re-

transmission of the procedure signal has been attempted the specified number of times but failed.

##111 TX / RX Memory error

##114 RX RTN has been received.

##200 RX A carrier has not been detected for 5 seconds during image reception.

##201 TX / RX DCN has been received in a method other than the binary procedure.

##204 TX DTC has been received even when there is no sending data.

##220 TX / RX System error (main program hang-up)

##224 TX / RX An error has occurred in the procedure signal in G3 transmission.

##226 TX / RX The stack pointer has shifted from the RAM area.

##229 RX The recording area has been locked for 1 minute.

##232 TX The encoder control unit has malfunctioned.

##237 RX The decoder control unit has malfunctioned.

##238 RX The print control unit has malfunctioned.

##261 TX / RX A system error has occurred between the modem and the system control board.

##280 TX Re-transmission of the procedure signal has been attempted the specified number of times, but failed.

##281 TX Re-transmission of the procedure signal has been attempted the specified number of times, but failed.

##282 TX Re-transmission of the procedure signal has been attempted the specified number of times, but failed.

##283 TX Re-transmission of the procedure signal has been attempted the specified number of times, but failed.

##284 TX After TCF transmission, DCN has been received.

##285 TX After EOP transmission, DCN has been received.

##286 TX After EOM transmission, DCN has been received.

##287 TX After MPS transmission, DCN has been received.

##288 TX After EOP transmission, a signal other than PIN, PIP, MCF, RTP, RTN has been received.

##289 TX After EOM transmission, a signal other than PIN, PIP, MCF, RTP, RTN has been received.

##290 TX After MPS transmission, a signal other than PIN, PIP, MCF, RTP, RTN has been received.

##670 TX In V.8 late start, the DIS V.8 ability from the receiving machine was detected, and CI was sent in

response; however, the procedure failed, causing T1 time-over.

##671 RX In V.8 call reception, the procedure fails to proceed to phase 2 after CM detection, causing T1 time-over.

##672 TX In V.34 transmission, the procedure fails to proceed from phase 2 to phase 3 or later, causing T1 time-

over

##673 RX In V.34 reception, the procedure fails to proceed from phase 2 to phase 3 or later, causing T1 time-over

##674 TX In V.34 transmission, the procedure fails to proceed from phase 3 or 4 to the control channel or later,

causing T1 time-over

##675 RX In V.34 reception, the procedure fails to proceed from phase 3 or 4 to the control channel or further,

causing T1 time-over

##750 TX After transmitting PPS-NULL in ECM transmission, no significant signal has been received, and re-

transmission of the procedure signal has been attempted the number of specified times but failed.

##752 TX After transmitting PPS-NULL in ECM transmission, DCN has been received.

##753 TX After transmitting PPS-NULL in ECM transmission, re-transmission of the procedure signal has been

9 / 45

attempted the number of specified times but failed, or T5 time-over (60 sec.) has occurred.

##754 TX After transmitting PPS-NULL in ECM transmission, re-transmission of the procedure signal has been

attempted the number of specified times but failed.

##755 TX After transmitting PPS-MPS in ECM transmission, no significant signal has been received, and re-

transmission of the procedure signal has been attempted the number of specified times but failed.

##757 TX After transmitting PPS-MPS in ECM transmission, DCN has been received.

##758 TX After transmitting PPS-MPS in ECM transmission, re-transmission of the procedure signal has been

attempted the number of specified times but failed, or T5 time-over (60 sec.) has occurred.

##759 TX After transmitting PPS-MPS in ECM transmission, re-transmission of the procedure signal has been

attempted the number of specified times but failed.

##760 TX After transmitting PPS-EOM in ECM transmission, no significant signal has been received, and re-

transmission of the procedure signal has been attempted the number of specified times but failed.

##762 TX After transmitting PPS-EOM in ECM transmission, DCN has been received.

##763 TX After transmitting PPS-EOM in ECM transmission, re-transmission of the procedure signal has been

attempted the number of specified times but failed, or T5 time-over (60 sec.) has occurred.

##764 TX After transmitting PPS-EOM in ECM transmission, re-transmission of the procedure signal has been

attempted the number of specified times but failed.

##765 TX After transmitting PPS-EOP in ECM transmission, no significant signal has been received, and re-

transmission of the procedure signal has been attempted the number of specified times but failed.

##767 TX After transmitting PPS-EOP in ECM transmission, DCN has been received.

##768 TX After transmitting PPS-EOP in ECM transmission, re-transmission of the procedure signal has been

attempted the number of specified times but failed, or T5 time-over (60 sec.) has occurred.

##769 TX After transmitting PPS-EOP in ECM transmission, re-transmission of the procedure signal has been

attempted the number of specified times but failed.

##770 TX After transmitting EOR-NULL in ECM transmission, no significant signal has been received, and re-

transmission of the procedure signal has been attempted the number of specified times but failed.

##772 TX After transmitting EOR-NULL in ECM transmission, DCN has been received.

##773 TX After transmitting EOR-NULL in ECM transmission, re-transmission of the procedure signal has been

attempted the number of specified times but failed, or T5 time-over (60 sec.) has occurred.

##774 TX After transmitting EOR-NULL in ECM transmission, ERR has been received.

##775 TX After transmitting EOR-MPS in ECM transmission, no significant signal has been received, and re-

transmission of the procedure signal has been attempted the number of specified times but failed.

##777 TX After transmitting EOR-MPS in ECM transmission, DCN has been received.

##778 TX After transmitting EOR-MPS in ECM transmission, re-transmission of the procedure signal has been

attempted the number of specified times but failed, or T5 time-over (60 sec.) has occurred.

##779 TX After transmitting EOR-MPS in ECM transmission, ERR has been received.

##780 TX After transmitting EOR-EOM in ECM transmission, no significant signal has been received, and re-

transmission of the procedure signal has been attempted the number of specified times but failed.

##782 TX After transmitting EOR-EOM in ECM transmission, DCN has been received.

##783 TX After transmitting EOR-EOM in ECM transmission, re-transmission of the procedure signal has been

attempted the number of specified times but failed, or T5 time-over (60 sec.) has occurred.

##784 TX After transmitting EOR-EOM in ECM transmission, ERR has been received.

##785 TX After transmitting EOR-EOP in ECM transmission, no significant signal has been received, and re-

transmission of the procedure signal has been attempted the number of specified times but failed.

##787 TX After transmitting EOR-EOP in ECM transmission, DCN has been received.

##788 TX After transmitting EOR-EOP in ECM transmission, re-transmission of the procedure signal has been

attempted the number of specified times but failed, or T5 time-over (60 sec.) has occurred.

##789 TX After transmitting EOR-EOP in ECM transmission, ERR has been received.

10 / 45

##790 RX After receiving EOR-EOP in ECM reception, ERR has been transmitted.

##791 TX / RX During the ECM mode procedure, a signal other than a significant one has been received.

##792 RX In ECM reception, PPS-NULL between partial pages has not been detected.

##793 RX During high-speed signal reception in ECM, no effective frame has been detected, and a time-over has

occurred.

2-4. Other Error Messages

Message on the LCD Cause Solution

The selected paper cannot be fed from cassette. Change the paper source and press [OK].

Cannot specify the followings together. Change one of the settings.

Device memory is full. Reduce the amount of photos, films, copies to scan.

Press <>.

(<>: Color button icon)

Press <>.

(<>: Black button icon)

There is no photo data. Supported image files are not in the

The paper type being used (business card, Credit Card size paper, or stickers, etc.) is not supported for paper feeding from the cassette.

Settings made conflict each other. (e.g. Selecting borderless printing on plain paper)

The memory is not sufficient to perform the print job in copying.

The Black button was pressed, but it is invalid.

The Color button was pressed, but it is invalid.

memory card.

Change the paper source to the rear tray.

Change the settings so that they will not conflict each other.

Reduce the amount of data to be printed, or print from a computer.

A temporary error. Press the Color button to continue the operation.

A temporary error. Press the Black button to continue the operation.

A temporary error.

- Confirm that supported image files are in the memory card.

- Images with double-byte characters used in the file name (or folder name) may not be recognized. Change the file (or folder) name so that it contains only single-byte alphanumeric characters.

- If images are edited on the computer, print them from the computer.

The value exceeds the number of copies you can print.

Memory card is not set. Insert the card after checking the direction.

DPOF information is not saved. DPOF print was selected in the menu, but

This layout is available only for A4 or 8.5"x11"(LTR).

Change the setting after removing the card.

The card is currently write-enabled. Remove card and set to read-only mode before performing operation.

During selecting images or specifying the number of copies, the total print quantity exceeds the prescribed value of 999.

The memory card is not inserted in the slot properly.

no DPOF files are contained in the memory card.

In Layout print, "Mixed 1, 2, or 3" which is available only with A4 or Letter size paper is selected, but the paper size is not set to A4 or Letter.

With a memory card inserted in the slot, change of the Read/Write attribute was attempted.

With the memory card set to the Read/write mode, Card Direct printing operation was attempted from the menu.

A temporary error. The last operation before the error is cancelled, and the total print quantity returns to the value before the error.

Set a memory card.

A temporary error. The LCD automatically returns to the display before the error occurrence.

A temporary error. Remove the memory card, then change the Read/Write attribute.

A temporary error. Remove the memory card, change the memory card setting to Read-only, then perform Card Direct

printing.

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The paper size is not correct. Check the page size you have set.

Failed to scan Photo Index Sheet. Check orientation/position and check that platen/sheet is clean. <See manual>

Failed to scan Photo Index Sheet. Check that all items are marked correctly. <See manual>

Failed to scan. Either document cannot be scanned or is not placed on the platen glass.

Cover is open. Close cover. The cover was opened during printing. Close the cover. The LCD returns to the

Scanner is not operating correctly. The CIS cannot detect the home position, or

Non-supported size of paper for Camera Direct printing via PictBridge connection is selected.

The machine failed in scanning the Photo Index Sheet.

The machine scanned the Photo Index Sheet, but markings in the sheet were incorrect.

The machine failed in scanning the document for Fit-to-page copy.

the scanner unit warming-up is not performed properly at power-on.

Cancel printing on the digital camera. Confirm the paper size, and print again.

Press the OK button to clear the error. Confirm the following, then try again:

- Clean the platen glass, and confirm that the Photo Index Sheet is not smeared.

- Place the sheet in the correct orientation and position.

Press the OK button to clear the error. Confirm the following, then try again:

- Fill in all the circles on the Photo Index Sheet properly.

- Place the sheet in the correct orientation and position.

Press the OK button to clear the error. Correct the settings, then try the operation again.

display before the error occurrence.

Press the OK button to clear the error, and turn the machine off and on again. If the error still occurs, repair servicing is required.

Document in ADF. Redo operation after checking document in ADF and pressing [OK].

Document size is too long. Redo operation after checking document on ADF and pressing [OK].

Document size not suitable for twosided scanning. Press [OK] to cancel operation and discharge document.

The document is left in the ADF. Remove the document from the ADF, press

The document is too long (longer than the Legal size length) for the ADF, or the document jams in the ADF.

The paper size is not supported for scanning on both sides of paper. (Only the A4 and Letter sizes are supported.)

2-5. Warnings

Warning Message on the LCD Solution

Low ink "!" is indicated for an applicable ink tank icon in

the Status Monitor.

Print head temperature rise

If the print head temperature does not fall, the print head error will occur.

the OK button to clear the error, then try the operation again.

Remove the document from the ADF, and press the OK button to clear the error. Confirm that the document size is supported, then try the operation again.

Press the OK button to clear the error. Perform scanning each side of paper separately.

No special solution. Since the ink will be used up soon, prepare for a new ink tank.

When the print head temperature falls, the error is automatically cleared. If the print head error is indicated, repair servicing is required.

Protection of excess rise of the print head temperature

Restrictions on paper The current paper cannot be set. Change the size

USB cable not connected

Cancellation of image Reset the selected photo information? - Select

If the print head temperature does not fall, the print head error will occur.

and type.

Set the PC to start scan. Connect the USB cable, then turn on the computer.

If the print head temperature exceeds the specified limit, an intermission is inserted during printing.

Re-select the supported paper type and size.

, and press the OK button.

Yes

select information Yes No => The image selection is cancelled, and the

12 / 45

Do you want to clear the scanned photo? Yes No

- Select No, and press the OK button.

menu or sub-menu is displayed.

=> The LCD returns to the display

immediately before the message was displayed.

2-6. Troubleshooting by Symptom

Symptom Solution

Faulty operation The power does not turn on.

The power turns off immediately after power-on.

A strange noise occurs. - Remove foreign material.

Nothing is displayed on the LCD. - Confirm the connection between the operation panel, the

A portion of the LCD is not displayed. The display flickers.

- Confirm the connection of

- the power cord, and

- between the logic board and the power supply unit.

- Replace the

- power supply unit, or

- logic board.

- Attach a removed part if any.

- Check the operation of the moving parts (such as purge unit, carriage unit, and paper feeding mechanism)

- Replace a faulty part, if any.

LCD unit, and the logic board.

- Replace the

- operation panel unit, or

- logic board.

- Perform the button and LCD test in the service mode, and confirm that the LCD is displayed without any segments missing or flickering.

- Confirm the connection between the operation panel, the scanning unit, and the harness.

- Replace the

- operation panel unit, or

- logic board.

Paper feed problems (multi-feeding, skewed feeding, no feeding).

Carriage movement problems (contact to other parts, strange noise).

- Examine the inside to confirm that no parts are damaged, and the rollers are clean.

- Remove foreign material.

- Adjust the paper guide properly.

- Set the paper properly.

- Confirm the following:

- selected paper source

- attachment of the rear cover

- connection of each harness and the logic board

- sheet feeder unit operation

- Replace the

- sheet feeder unit,

- cassette unit, or

- logic board.

- Confirm that the carriage timing slit strip film is free from damage or grease.

- Clean the carriage timing slit strip film (with ethanol and lint-free paper).

- Remove foreign material.

- Replace the

- carriage timing slit strip film, or

- carriage unit.

Faulty scanning (no scanning, strange noise).

- Confirm the connection between the scanning unit and the logic board.

- Replace the

13 / 45

- scanning unit, or

- logic board.

The CD / DVD tray is not pulled in the feeder.

- Confirm that the reflector of the CD / DVD tray is clean and is free from any damages.

- Replace the

- CD / DVD tray, or

- logic board.

No feeding from the ADF (no operation of the ADF motor).

- Confirm the connection

- between the ADF motor and the ADF PWB, and

- between the ADF PWB and the logic board.

- Replace the

- document feed unit, or

- logic board.

No sound from the speaker. - Confirm the connection between the speaker and the logic

board.

- Replace the

- speaker, or

- logic board.

Unsatisfactory print quality No printing, or no color ejected. - Confirm that the orange tape is properly removed from an

ink tank, and the ink tanks are installed properly.

- Perform print head maintenance.

- Replace the

- ink tank, or

- print head

- Remove foreign material from the purge unit caps, if any.

- Replace the

- purge unit, or

- logic board.

Printing is faint, or white lines appear on printouts even after print head cleaning. Line(s) not included in the print data appears on printouts.

- Remove and re-install the print head.

- Confirm that the ink tanks are installed properly.

- Perform print head maintenance.

- Replace the

- ink tank, or

- print head

- Perform the following:

- Automatic or manual print head alignment in the user mode

- LF / Eject correction in the service mode

- Clean the paper feed rollers.

- Replace the

- purge unit, or

- logic board.

Paper gets smeared. - Feed several sheets of paper.

- Perform bottom plate cleaning.

- Clean the paper path with a cotton swab or cloth.

- Clean the paper feed rollers.

The back side of paper gets smeared. - Clean the platen rib (clean the paper path with a cotton

swab or cloth).

- Confirm that the platen ink absorber fits in place properly.

- Confirm that the paper eject rollers are free from ink smear.

A part of a line is missing on printouts. - Perform nozzle check pattern printing, and confirm that

ink is properly ejected from all the nozzles.

- Replace the

- ink tank, or

- print head

Color hue is incorrect. - Confirm that the ink tanks are installed properly.

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- Perform print head maintenance.

- Replace the

- ink tank, or

- print head

- Perform print head alignment.

Printing is incorrect. Replace the logic board.

No ejection of black ink. - Confirm that the ink tanks are installed properly.

- Perform print head maintenance.

- Replace the

- ink tank, or

- print head

- Remove foreign material from the purge unit caps, if any.

- Replace the purge unit.

Graphic or text is enlarged on printouts.

When enlarged in the carriage movement direction:

- Clean grease or oil off the timing slit strip film.

- Replace the

- timing slit strip film,

- carriage unit,

- logic board, or

- scanning unit (when copying)

When enlarged in the paper feed direction:

- Clean grease or oil off the timing slit disk film or the timing slit disk eject film.

- Replace the

- timing slit disk film,

- timing slit disk eject film,

- timing sensor unit,

- LF roller,

- platen unit,

- logic board, or

- scanning unit (when copying)

Faulty scanning No scanning. - Confirm the connection between the scanning unit and

the logic board.

- Replace the

- scanning unit, or

- logic board.

- Confirm that the MP drivers are installed properly.

- Confirm that the USB cable is connected properly.

Streaks or smears on the scanned image.

- Clean the platen glass.

- Confirm the connection between the scanning unit and the logic board.

- Replace the

- scanning unit,

- logic board, or

- document pressure sheet.

The document slips over the rollers (a copied image is enlarged as a result), or document sheets are not separated from each other.

- Clean the

- friction tab,

- document feed rollers, and

- separation rollers.

- Replace the document feed unit.

*1: Replace the print head only after the print head deep cleaning is performed 2 times, and when the problem persists.

<2. LIST OF ERROR DISPLAY / INDICATION>

MX850 TABLE OF CONTENTS

15 / 45

3. REPAIR

3-1. Notes on Service Part Replacement (and Disassembling / Reassembling)

Service part

Logic board ass'y - Before removal of the logic

Absorber kit

Notes on replacement

board ass'y, remove the power cord, and allow for approx. 1 minute (for discharge of capacitor's accumulated charges), to prevent damages to the logic board ass'y.

- Before replacement, check the ink absorber counter value (by service test print or EEPROM information print). [See 3-4. Verification Items, (1)

Service test print for details.]

After replacement:

1. Initialize the EEPROM.

2. Set the ink absorber counter value.

3. Set the destination in the EEPROM.

4. Correct the CD / DVD and automatic print head alignment sensors.

5. Check the ink system function.

6. Perform LF / Eject correction.

7. Perform button and LCD test. [See 3-3. Adjustment /

Settings, (6) Service mode,

for details of 1 to 7.]

8. Perform print head alignment and LCD language setting in the user mode.

After replacement:

1. Reset the ink absorber counter. [See 3-3. Adjustment /

Settings, (6) Service mode,

for details.]

Adjustment / settings Operation check

- EEPROM information print

- Service test print

- Printing via USB connection

- Copying

- Direct printing from a digital camera (PictBridge)

- FAX sending and receiving

- Ink absorber counter volume print (After the ink absorber counter is reset, the counter value is printed automatically.)

Carriage unit

Paper feed motor - The red screws securing the

paper feed motor are allowed to be loosened only for paper feed motor replacement. (DO NOT loosen them in any other cases.)

Platen unit

At replacement:

1. Apply grease to the sliding portions. [See 3-3.

Adjustment / Settings, (3) Grease application.]

2. Check the ink system function. [See 3-3. Adjustment /

Settings, (6) Service mode,

for details.]

3. Perform print head alignment in the user mode.

At replacement:

1. Adjust the paper feed motor. [See 3-3. Adjustment /

Settings, (1) Paper feed motor adjustment, for details.]

After replacement:

1. Check the ink system function.

2. Perform LF / Eject correction. [See 3-3. Adjustment /

Settings, (6) Service mode,

for details.]

- Service test print (Confirm CD / DVD and automatic print head alignment sensor correction, and ink system function.)

- Service test print

PR lift shaft ass'y

At replacement:

- Service test print

Input carriage lift gear 1. Apply grease to the sliding

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portions. [See 3-3. Adjustment /

Settings, (3) Grease application, for details.]

Document feed base

Document pressure sheet

Operation panel board ass'y

LCD viewer unit

Scanner unit

Timing slit strip film - Upon contact with the film,

Timing slit disk film

Timing slit disk eject film

Print head

- Be cautious not to scratch or damage the LCD hinge FFC.

wipe the film with ethanol.

- Confirm no grease is on the film. (Wipe off any grease thoroughly with ethanol.)

- Do not bend the film

At replacement:

1. Confirm the document pressure sheet position. [See 3-3. Adjustment /

Settings, (2) Document pressure sheet replacement,

for details.]

At replacement:

1. Check the LCD and operation panel. [See 3-3. Adjustment /

Settings, (6) Service mode,

for details.]

After replacement:

1. Perform print head alignment in the user mode.

2. Perform LF / Eject correction in the service mode. [See 3-3. Adjustment /

Settings, (6) Service mode,

for details.]

After replacement:

1. Perform print head alignment in the user mode.

- Service test print

*1: General notes:

- Make sure that the flexible cables and wires in the harness are in the proper position and connected correctly. See 3-2.

Special Notes on Repair Servicing or the Parts Catalog for details.

- Do not drop the ferrite core, which may cause damage.

- Protect electrical parts from damage due to static electricity.

- Before removing a unit, after removing the power cord, allow the machine to sit for approx. 1 minute (for capacitor

discharging to protect the logic board ass'y from damages).

- Do not touch the timing slit strip film, timing slit disk film, and timing slit disk eject film. No grease or abrasion is

allowed.

- Protect the units from soiled with ink.

- Protect the housing from scratches.

- For the MX850 automatic print head alignment, use Matte Photo Paper (MP-101) to ensure alignment accuracy.

- Exercise caution with the screws, as follows:

i. The red screws of the paper feed motor may be loosened only at replacement of the paper feed motor unit

(DO NOT loosen them in other cases).

ii. DO NOT loosen the red screws on both sides of the main chassis, securing the carriage shaft positioning

(they are not adjustable in servicing)

<3-1. Notes on Service Part Replacement>

MX850 TABLE OF CONTENTS

17 / 45

3. REPAIR

3-2. Special Notes on Repair Servicing (Click on the image to enlarge it.)

Be sure to protect the machine from static electricity in repair servicing, especially the LCD, operation panel board, scanner unit, logic

board, card board, and NCU board.

************************************************************************

If the power cord is disconnected from the machine (a hard-power-off),

the date/time settings and all the documents saved in the machine memory will be lost.

*************************************************************************

(1) External housing, ADF, and scanner unit removal

1) Remove the cassette, LAN connector cover, and telephone jack cover.

2) Remove the side covers L and R.

i. Remove 4 screws from the rear cover, and 1 screw each from the front left and front right.

ii. Release the hooks inside the cover.

iii. Release the boss on the front right and front left (beside the removed screws).

18 / 45

iv. Release the hooks of the cassette slot.

3) Remove the front covers L and R.

Release the hooks (No.1 in the photos below), and lift the covers (No. 2 in the photos below).

4) Remove the paper output tray.

19 / 45

Slide the door damper to the left until it is released, then remove the tray.

5) Remove the ADF unit.

i. Disconnect the connector, and remove the screw. ii. Disengage the right hinge (while slightly pushing the

hinge to the right, pull up the document cover).

iii. Disengage the left hinge (slowly lay back the document cover).

6) Remove the scanner unit.

20 / 45

i. On the right side, disconnect the connector and ground

wire, and remove the logic board cover (for the ground

ii. Disconnect the connectors. Remove the core from the

flat cable, then put the flat cable inside the main case.

wire and logic board cover, remove 1 screw each).

iii. Remove the damper unit (4 screws). iv. Release the scanner lock hook.

v. Remove the damper gear (2 screws), and release the

scanner lock (1 screw). (The scanner unit can be removed without removing the damper gear.)

vi. While holding the scanner unit in the opened position,

disengage the right hinge by slightly pushing the hinge to the right and pulling up the scanner unit.

vii. Disengage the left hinge by sliding the scanner unit to the left.

21 / 45

7) Remove the main case.

i. Remove the 3 screws. ii. Release the hook on the left side.

(2) Printer unit separation from the bottom case (how to remove the screw under the purge unit)

1) Rotate the purge unit gear toward the rear side of the machine to unlock the carriage.

2) Slide the carriage to the opposite of the home position (to the left), and remove the screw.

22 / 45

(3) Operation panel removal

1) Remove the panel cover.

Using a flat-blade screwdriver, release the front side of the panel cover.

While slightly lifting up the cover, pull it toward you.

2) Remove the panel unit.

Remove the 6 screws that fix the panel unit to the scanner unit. Pull the panel unit toward you, then disconnect the

connector and the ground wire (1 screw).

3) Remove the panel board.

23 / 45

Remove the 14 screws and disconnect the connector.

Caution: DO NOT turn over the panel frame after the panel board is removed. The buttons are not fixed to the

frame, thus they will fall if the frame is turned over.

(4) AC adapter attachment

< Japan model >

Using a thin flat-blade screwdriver, push the arrester ground wire until it fits to the arrester ground pin inside the AC

adapter.

ote: After connection, gently pull the ground wire and confirm that it will not be removed.

< Other models>

24 / 45

Fit the arrester ground wire in 2 grooves as shown in the photo.

(5) Emblem removal

Push the top edge of the emblem to remove it from the double-sided adhesive tape.

(6) Cable wiring and connection

1) Wiring on the right side

Be cautious of the core position.

+ 63 hidden pages